Nanosized TiO２2 particles are prepared by sol-gel method, the avera ge size of which varies from 15 to 23nm. These nanoporous TiO２2 films are ap plied to d ye-sensitized solar cell modules. The x-ray diffraction patterns are used to d etermine the phase and average nanocrystalline size of TiO２2. The sh ape and pa rticles size of the crystal TiO２2 are shown by transmission electron microscop e. The conditions of nanoporous films microstructure in solar cells are measured by testing the BET surface and the microscopy of titania films. The photovoltai c performance of dye-sensitized solar cell modules with the size of 15cm×20 cm (the active area is 187.2cm２2) is discussed, at the same ti me, the eff ect of nanoporous TiO２2 films microstructure and average particles s ize of nan ocrystalline TiO２2 on dye-sensitized nanosized films solar cells is investigated in this paper.